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Note 5 - Common Shares and Earnings Per Share - Reconciliation of Company's Common Shares (Details)
 6 Months Ended
Jun. 30, 2020
shares
Common Share Outstanding, Beginning Balance (in shares) 40,157,591
Dividends Reinvested (in shares) 63,929
Cash Invested (in shares) 30,345
Vesting of Restricted Stock Units (in shares) 35,720
Cash Invested (in shares) 13,432
Dividends Reinvested (in shares) 4,835
Restricted Stock Issued to Directors (in shares) 17,400
Directors Deferred Compensation (in shares) 612
Shares Withheld for Individual Income Tax Requirements (in shares) (38,217)
Common Shares Outstanding, ending balance (in shares) 40,848,828
Performance Awards 2017 [Member]  
Executive Stock Performance Awards (2017 awards earned) (in shares) 62,497
At the Market Offering [Member]  
At-the-Market Offering (in shares) 500,684